Strain insulator



.INI/E TOR ATTORNEY Apr. 24, 1923.

\WITNESS M UnlliilED .TSTA EZLS LOUIS SlEINBERG-EB, EE BRGC KLYN, NEW

STRAIN INSULATOR.

A plication filed November 8-6 1918.

0 (a l whome't may concern lZ-e it known that l, LoUrs Eirnnvnnnonn, a citizen of the United States, and a resident or t' e borough of Brooklyn, city and State of New "i'ork, have invented certain new and useful Improvements in Strain lnsulators, or which the following is a specification.

One at the objects of my invention is to provide strain member for an insulator in which the exposed bridge portions are insulated from the leg portions.

Another object of my invention is to insulate the strain members "from each other by means separate and independent of the main insulator body.

Another object of my invention is to so construct a strain insulator that it may be readily assembled and disassembled, and to provide means for insulating the parts of the strain members from each other by means which are separate from and independent of the main body of the insulating material.

Another object of my invention is to provide a removable sheath or cover of insulating material for the leg portion of the strain members of an insulator.

Referring to the drawings in which the same reference character indicates the same part inv the several views:

Fig. 1 is a view partly in elevation, partly in vertical section, of an insulator embodying my invention.

Fig. 2 is a. section on line 2 2 of 3 is a detail.

In constructing invention 1 form the body of insulating material It into suitable shape, preferably that shown in the drawings in which the body is elongated and has an alternate series of horizontal grooves a. and ridges b in the surface thereof. thereby extending; the area ot the same, and at each end I provide a projecting portion 10 and ll, each of which portions is covered with a metal cap C and U for resisting the rrushinn" action of the rain members.

T he body portion of the insulator is made of any suitable insulating material, such as that well known in theart as electrose, or may be made of porcelain, glass or any other suitable heat resisting or fireproof insulating material.

hen the body is made of electrose it may be molded into the form shown, and the metal caps or strain resisting members-C Serial No. 264,772.

are preterably molded onto the respective ends oi the body of insulating maeriai, or tl'iey may be cemented thereto or aided thereon, as illustrated at 40 in Fig. wheieas when the body of insulating marial is made oi? glass, porcelain or other suitable lire-pivot or vitreous material, the metal caps (l and C are secured to the insulator l a cement, or they may be screw threaded .is also illustrated at ll) in Fig. 1.

fhe caps C and C may be of any other suitable shape or i'orm than that illustrated. Ti he insulator bod; at each end is lessened in diameter as shown, thereby forming ats l5 and 16 for the reception of '7 and 18 forming a part of the bridge ortions oi the strain members.

The strain members are duplicates'ot each other and a d scription of one serves for all, being wider-stood that the two strain embeis are secured to the insulator body .n positions at right angles to each other to prevent them from moving tmvards each other when subject to strain. o

ins n I be accomplished in many ways; one way is to provide grooves or seats 60 for engagement with the radially extending arms 20, 21. Q0 and 21 as shown. The arms 20. 2t, 20 and 21 are connected respectively with the leg portions 22, 23, 24 and of tie strain members. The upper ends of the strain members are screw-threaded and nuts and engage with the said screw threads and with the screw threads on the removable portion of the strain member as shown.

Tubes T, T. T and T of the insulating material are respectively placed around the entire leg portions of the strain members and each extends irom the radial projecting arms 2O, 21, and 20. 21 to the nuts 30 and 31 and are held in position between the two, the nuts preventing the tubes from moving up or down or makingany change in position. it is to be understood that the same construction and arrangement is present with respect to the other strain members.

The position oi the securing nuts should be at least. tour times the distance or the ring shaped bridge members from the insulator tube in order to secure an eilective insulation.

[is will be seen from the structure above described, the body of insulating material and the strain members may be assembled. readily and quickly.

The purpose of the insulating tube around the legs of the strain members is to increase the insulation value of the insulator. \Vithout the tube, the limit of insulation value of this insulator would be the air space a" between the arm or leg and the strain member and the ring of the bridge portion. By encasing the legs of the strain members by means of the sleeve or tube of insulating material I have increased the value of the insulation by substituting for a portion of the air insulation an insulating material that resists being punctured very much more than air does.

As changes of construction could be made Within the scope of my invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is: v

1. In a device of the kind described, an insulator consisting of an insulating body and exposed strain members removably secured thereto, the leg portions of which are situated at a distance therefrom, said strain members being insulated from each other by means other than air and the main in sulating body.

2. In a device of the kind described, an insulating body, strain members provided with bridge, and leg portions, the bridge portions engaging the insulating body and the leg portions of the strain members being spaced from said insulating body and encased in individual sleeves of insulating material.

3. In a device of the kind described, an insulating body, strain members provided with bridge and leg portions, the bridge portions engaging the insulating body and the leg ortions of th strain members being situated at a distance from the insulating body, and a tube or sleeve of insulating material surrounding each of the legs of the strain members.

4. In a device of the kind described, a body of insulating material, strain members provided with bridge and leg portions removably secured thereto, and a sleeve or jacket of insulating material removably secured to each of the leg portions of the strain members.

5. In a device of the kind described, a body of insulating material, strain members having bridge portions contacting with the ends of said body, leg portions extending axially beyond said bridge portions, the leg portions of each strain member being insulated from the bridge portion of the other strain memher by tubular insulators surrounding the said leg portions.

(3. In a device of the kind described, a body of insulating material, strain members having bridge portions contacting with the ends of said body, leg portions extending axially beyond said bridge portions, the leg portions of each strain member being insulated from the bridge portion of the other strain member by tubular insulators surrounding the said leg portions, and extending on said leg portions past said bridge portions.

7. In a device of the kind described, a body of insulating material, strain members having bridge portions contacting with the ends of said body, leg portions extending axially beyond said bridge portions, the leg portions of each strain member being insulated. from the bridge portion of the other strain member by tubular insulators surrounding the said leg portions, yokes for said leg portions, and nuts attaching said yokes to said leg portions and holding the insulating tubes in position on said leg portions.

In witness whereof, I have hereunto set my hand at the borough of Manhattan, city and State of New York, this 19th day of November, 1918.

LOUIS STEINBERGER.

In presence of- ZITA M. GRAHAM. 

